As of late afternoon, Christopher Hays, 30, "no longer works for the San Diego Police Department,'' SDPD public-affairs Lt. Kevin Mayer said.

Lansdowne disclosed the other investigation during a hastily called briefing at downtown police headquarters. The officer in question has been placed on leave pending the outcome of the case, Lansdowne said.

Back in May 2011, nine San Diego police officers were accused of misconduct within three months. Police Chief William Lansdowne apologized for the incidents.

The alleged victim in the latest case came forward last Wednesday, initially contending that the officer who groped her and exposed himself to her following her arrest on suspicion of auto theft last year was Hays, the chief said. She later changed her identification following questioning by detectives.

Lansdowne said he was prevented by law from identifying the new suspect, because the patrolman has not been charged with a crime.

During the news conference, SDPD officials also announced a plan to require that two officers be present following the arrest of female suspects.

The change, designed to preclude sexual improprieties by officers, should go into effect over the next several days, Mayer said.

Hays pleaded not guilty on Tuesday to a pair of felony false imprisonment counts and three misdemeanor sexual battery allegations. He faces up to three years and eight months in prison if convicted.

Following Hays' arraignment, defense attorney Kerry Armstrong told reporters his client's decision to resign was by no means an indication that he had "done anything wrong.'' Armstrong said.

"He's extremely upset with the police department for not backing him in this case, and it's really hurt him,'' Armstrong said. "He's very upset about it, and he thinks that his career in law enforcement is over because of these allegations.''

Hays, a former Marine and married father of two, served with the department for four years before being arrested 10 days ago. His father-in-law is SDPD Assistant Chief Mark Jones.

The charges against Hays, who is free on $130,000 bail, involve four women he allegedly victimized between October and December of last year, according to District Attorney Bonnie Dumanis. Several of them claim that he groped them during searches, and one told investigators he forced her to perform a sex act in the back of his patrol car.

Three other women also have come forward and accused Hays of similar illegal acts. Those allegations remain under review, Dumanis said.

I am so pleased this is commonplace and casual abuse is coming to light. This has been an unspoken perk of the job for more than the handful of bad eggs. These guys are under a lot of stress and misconduct like this has been an long accepted way to blow it off.